Yet, imperceptible to the human eye.

肉眼却无法看见它。

However, the cold weather seems to be imperceptible to winter swimming enthusiasts.

寒冷天气并没有冷却冬泳爱好者们热情。

An almost imperceptible raise of the hand indicates a bid.

一个几乎不到举手则表示叫牌。

Oh, gives a little bit of spray. It's almost imperceptible.

它喷出了一点点毒液，几乎不到。

Or is it his almost imperceptible limp from last year's water crossing?

还是他去年过河时几乎不到跛行？

The idea is that it's sort of imperceptible which one it is.

这个想法是，它有点难该是哪一个定位。

His hearing is better than ours too, tuned to sounds that are completely imperceptible to the human ear.

它听力也比我们强，能听到人耳完全听不到声音。

I bowed to him. He gave me an almost imperceptible bow in return, without saying a word to me.

我向他行个礼。他回答我一个礼，这是一种差不多看不出来礼，一句话也没有说。

These are vocalizations which are normally imperceptible to humans, and which form a fundamental part of cetacean social behavior.

这些发声通常是人类不到，也是鲸目动物社会行为基本组成部分。

This last with soft, almost imperceptible, cynicism.

最后是柔和、几乎难愤世嫉俗。

It responded to an almost imperceptible touch on it.

它对几乎难触碰做出了反应。

Their intimacy increased by regular and almost imperceptible degrees.

他们亲密程度有规律地增加， 几乎难。

The instances of a word shade off into other movements by imperceptible degrees.

一个词实例难程度逐渐融入其他动作。

This would make his movements so impossibly slow that they would be all but imperceptible to the enemy.

这将使他动作慢得不可思议，至于敌人几乎不到。

The almost imperceptible shrug that said Who cares about her?

几乎不到耸耸肩, 说谁关心她?

I don't know why that thought filled me with a very faint, almost imperceptible joy.

我不知道为什么这个想法让我心里充满了一种非常淡淡、几乎难喜悦。

Yet, this genetic material may be present in such imperceptible amounts that actually detecting it is difficult.

，这种遗传物质可能难数量存在，至于很难真正检测到它。

Passing by imperceptible gradations from one form to another, it will be seen to achieve the strangest metamorphoses.

从一种形式到另一种形式， 通过不可渐进，我们将看到它实现了最奇怪变形。

The story is about a little dog who hears a tiny, almost imperceptible noise and tries to identify it.

这个故事是关于一只小狗听到了一个微小到几乎难声音， 并试图去辨认出它。

The end part of the wing, just  beyond the outboard engine pylon, has an almost imperceptible twist  to it.

机翼末端，就在舷外发动机挂架之外，有一个几乎不到扭曲。